libfcoe.c 36.3 KB
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/*
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 * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2009 Intel Corporation.  All rights reserved.
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 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/netdevice.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <net/rtnetlink.h>

#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fcoe.h>
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#include <scsi/libfc.h>
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#include <scsi/libfcoe.h>
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MODULE_AUTHOR("Open-FCoE.org");
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MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs");
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MODULE_LICENSE("GPL v2");
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#define	FCOE_CTLR_MIN_FKA	500		/* min keep alive (mS) */
#define	FCOE_CTLR_DEF_FKA	FIP_DEF_FKA	/* default keep alive (mS) */

static void fcoe_ctlr_timeout(unsigned long);
static void fcoe_ctlr_link_work(struct work_struct *);
static void fcoe_ctlr_recv_work(struct work_struct *);

static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;

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unsigned int libfcoe_debug_logging;
module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
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#define LIBFCOE_LOGGING     0x01 /* General logging, not categorized */
#define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */

#define LIBFCOE_CHECK_LOGGING(LEVEL, CMD)				\
do {                                                            	\
	if (unlikely(libfcoe_debug_logging & LEVEL))			\
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		do {							\
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			CMD;						\
		} while (0);						\
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} while (0)
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#define LIBFCOE_DBG(fmt, args...)					\
	LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING,				\
			      printk(KERN_INFO "libfcoe: " fmt, ##args);)
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#define LIBFCOE_FIP_DBG(fmt, args...)					\
	LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING,			\
			      printk(KERN_INFO "fip: " fmt, ##args);)
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/*
 * Return non-zero if FCF fcoe_size has been validated.
 */
static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
{
	return (fcf->flags & FIP_FL_SOL) != 0;
}

/*
 * Return non-zero if the FCF is usable.
 */
static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
{
	u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;

	return (fcf->flags & flags) == flags;
}

/**
 * fcoe_ctlr_init() - Initialize the FCoE Controller instance.
 * @fip:	FCoE controller.
 */
void fcoe_ctlr_init(struct fcoe_ctlr *fip)
{
	fip->state = FIP_ST_LINK_WAIT;
	INIT_LIST_HEAD(&fip->fcfs);
	spin_lock_init(&fip->lock);
	fip->flogi_oxid = FC_XID_UNKNOWN;
	setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
	INIT_WORK(&fip->link_work, fcoe_ctlr_link_work);
	INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
	skb_queue_head_init(&fip->fip_recv_list);
}
EXPORT_SYMBOL(fcoe_ctlr_init);

/**
 * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller.
 * @fip:	FCoE controller.
 *
 * Called with &fcoe_ctlr lock held.
 */
static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;

	fip->sel_fcf = NULL;
	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
		list_del(&fcf->list);
		kfree(fcf);
	}
	fip->fcf_count = 0;
	fip->sel_time = 0;
}

/**
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 * fcoe_ctlr_destroy() - Disable and tear-down the FCoE controller.
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 * @fip:	FCoE controller.
 *
 * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 *
 * The receive handler will have been deleted before this to guarantee
 * that no more recv_work will be scheduled.
 *
 * The timer routine will simply return once we set FIP_ST_DISABLED.
 * This guarantees that no further timeouts or work will be scheduled.
 */
void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
{
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	cancel_work_sync(&fip->recv_work);
	spin_lock_bh(&fip->fip_recv_list.lock);
	__skb_queue_purge(&fip->fip_recv_list);
	spin_unlock_bh(&fip->fip_recv_list.lock);

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	spin_lock_bh(&fip->lock);
	fip->state = FIP_ST_DISABLED;
	fcoe_ctlr_reset_fcfs(fip);
	spin_unlock_bh(&fip->lock);
	del_timer_sync(&fip->timer);
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	cancel_work_sync(&fip->link_work);
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}
EXPORT_SYMBOL(fcoe_ctlr_destroy);

/**
 * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port.
 * @fip:	FCoE controller.
 *
 * Returns the maximum packet size including the FCoE header and trailer,
 * but not including any Ethernet or VLAN headers.
 */
static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
{
	/*
	 * Determine the max FCoE frame size allowed, including
	 * FCoE header and trailer.
	 * Note:  lp->mfs is currently the payload size, not the frame size.
	 */
	return fip->lp->mfs + sizeof(struct fc_frame_header) +
		sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
}

/**
 * fcoe_ctlr_solicit() - Send a solicitation.
 * @fip:	FCoE controller.
 * @fcf:	Destination FCF.  If NULL, a multicast solicitation is sent.
 */
static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
{
	struct sk_buff *skb;
	struct fip_sol {
		struct ethhdr eth;
		struct fip_header fip;
		struct {
			struct fip_mac_desc mac;
			struct fip_wwn_desc wwnn;
			struct fip_size_desc size;
		} __attribute__((packed)) desc;
	}  __attribute__((packed)) *sol;
	u32 fcoe_size;

	skb = dev_alloc_skb(sizeof(*sol));
	if (!skb)
		return;

	sol = (struct fip_sol *)skb->data;

	memset(sol, 0, sizeof(*sol));
	memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
	memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	sol->eth.h_proto = htons(ETH_P_FIP);

	sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	sol->fip.fip_op = htons(FIP_OP_DISC);
	sol->fip.fip_subcode = FIP_SC_SOL;
	sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
	sol->fip.fip_flags = htons(FIP_FL_FPMA);
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	if (fip->spma)
		sol->fip.fip_flags |= htons(FIP_FL_SPMA);
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	sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
	sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
	memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);

	sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
	sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
	put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);

	fcoe_size = fcoe_ctlr_fcoe_size(fip);
	sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
	sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
	sol->desc.size.fd_size = htons(fcoe_size);

	skb_put(skb, sizeof(*sol));
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);

	if (!fcf)
		fip->sol_time = jiffies;
}

/**
 * fcoe_ctlr_link_up() - Start FCoE controller.
 * @fip:	FCoE controller.
 *
 * Called from the LLD when the network link is ready.
 */
void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
{
	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
		fip->last_link = 1;
		fip->link = 1;
		spin_unlock_bh(&fip->lock);
		fc_linkup(fip->lp);
	} else if (fip->state == FIP_ST_LINK_WAIT) {
		fip->state = FIP_ST_AUTO;
		fip->last_link = 1;
		fip->link = 1;
		spin_unlock_bh(&fip->lock);
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		LIBFCOE_FIP_DBG("%s", "setting AUTO mode.\n");
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		fc_linkup(fip->lp);
		fcoe_ctlr_solicit(fip, NULL);
	} else
		spin_unlock_bh(&fip->lock);
}
EXPORT_SYMBOL(fcoe_ctlr_link_up);

/**
 * fcoe_ctlr_reset() - Reset FIP.
 * @fip:	FCoE controller.
 * @new_state:	FIP state to be entered.
 *
 * Returns non-zero if the link was up and now isn't.
 */
static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
{
	struct fc_lport *lp = fip->lp;
	int link_dropped;

	spin_lock_bh(&fip->lock);
	fcoe_ctlr_reset_fcfs(fip);
	del_timer(&fip->timer);
	fip->state = new_state;
	fip->ctlr_ka_time = 0;
	fip->port_ka_time = 0;
	fip->sol_time = 0;
	fip->flogi_oxid = FC_XID_UNKNOWN;
	fip->map_dest = 0;
	fip->last_link = 0;
	link_dropped = fip->link;
	fip->link = 0;
	spin_unlock_bh(&fip->lock);

	if (link_dropped)
		fc_linkdown(lp);

	if (new_state == FIP_ST_ENABLED) {
		fcoe_ctlr_solicit(fip, NULL);
		fc_linkup(lp);
		link_dropped = 0;
	}
	return link_dropped;
}

/**
 * fcoe_ctlr_link_down() - Stop FCoE controller.
 * @fip:	FCoE controller.
 *
 * Returns non-zero if the link was up and now isn't.
 *
 * Called from the LLD when the network link is not ready.
 * There may be multiple calls while the link is down.
 */
int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
{
	return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
}
EXPORT_SYMBOL(fcoe_ctlr_link_down);

/**
 * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF.
 * @fip:	FCoE controller.
 * @ports:	0 for controller keep-alive, 1 for port keep-alive.
 * @sa:		source MAC address.
 *
 * A controller keep-alive is sent every fka_period (typically 8 seconds).
 * The source MAC is the native MAC address.
 *
 * A port keep-alive is sent every 90 seconds while logged in.
 * The source MAC is the assigned mapped source address.
 * The destination is the FCF's F-port.
 */
static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, int ports, u8 *sa)
{
	struct sk_buff *skb;
	struct fip_kal {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_mac_desc mac;
	} __attribute__((packed)) *kal;
	struct fip_vn_desc *vn;
	u32 len;
	struct fc_lport *lp;
	struct fcoe_fcf *fcf;

	fcf = fip->sel_fcf;
	lp = fip->lp;
	if (!fcf || !fc_host_port_id(lp->host))
		return;

	len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr);
	BUG_ON(len < sizeof(*kal) + sizeof(*vn));
	skb = dev_alloc_skb(len);
	if (!skb)
		return;

	kal = (struct fip_kal *)skb->data;
	memset(kal, 0, len);
	memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(kal->eth.h_source, sa, ETH_ALEN);
	kal->eth.h_proto = htons(ETH_P_FIP);

	kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	kal->fip.fip_op = htons(FIP_OP_CTRL);
	kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
	kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
				    ports * sizeof(*vn)) / FIP_BPW);
	kal->fip.fip_flags = htons(FIP_FL_FPMA);
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	if (fip->spma)
		kal->fip.fip_flags |= htons(FIP_FL_SPMA);
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	kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
	kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
	memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);

	if (ports) {
		vn = (struct fip_vn_desc *)(kal + 1);
		vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
		vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
		memcpy(vn->fd_mac, fip->data_src_addr, ETH_ALEN);
		hton24(vn->fd_fc_id, fc_host_port_id(lp->host));
		put_unaligned_be64(lp->wwpn, &vn->fd_wwpn);
	}

	skb_put(skb, len);
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);
}

/**
 * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it.
 * @fip:	FCoE controller.
 * @dtype:	FIP descriptor type for the frame.
 * @skb:	FCoE ELS frame including FC header but no FCoE headers.
 *
 * Returns non-zero error code on failure.
 *
 * The caller must check that the length is a multiple of 4.
 *
 * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 * Headroom includes the FIP encapsulation description, FIP header, and
 * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 */
static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip,
			    u8 dtype, struct sk_buff *skb)
{
	struct fip_encaps_head {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_encaps encaps;
	} __attribute__((packed)) *cap;
	struct fip_mac_desc *mac;
	struct fcoe_fcf *fcf;
	size_t dlen;
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	u16 fip_flags;
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	fcf = fip->sel_fcf;
	if (!fcf)
		return -ENODEV;
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	/* set flags according to both FCF and lport's capability on SPMA */
	fip_flags = fcf->flags;
	fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : FIP_FL_FPMA;
	if (!fip_flags)
		return -ENODEV;

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	dlen = sizeof(struct fip_encaps) + skb->len;	/* len before push */
	cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));

	memset(cap, 0, sizeof(*cap));
	memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	cap->eth.h_proto = htons(ETH_P_FIP);

	cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	cap->fip.fip_op = htons(FIP_OP_LS);
	cap->fip.fip_subcode = FIP_SC_REQ;
	cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW);
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	cap->fip.fip_flags = htons(fip_flags);
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	cap->encaps.fd_desc.fip_dtype = dtype;
	cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;

	mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
	memset(mac, 0, sizeof(mac));
	mac->fd_desc.fip_dtype = FIP_DT_MAC;
	mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
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	if (dtype != FIP_DT_FLOGI)
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		memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN);
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	else if (fip->spma)
		memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	return 0;
}

/**
 * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 * @fip:	FCoE controller.
 * @skb:	FCoE ELS frame including FC header but no FCoE headers.
 *
 * Returns a non-zero error code if the frame should not be sent.
 * Returns zero if the caller should send the frame with FCoE encapsulation.
 *
 * The caller must check that the length is a multiple of 4.
 * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 */
int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fc_frame_header *fh;
	u16 old_xid;
	u8 op;

	fh = (struct fc_frame_header *)skb->data;
	op = *(u8 *)(fh + 1);

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	if (op == ELS_FLOGI) {
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		old_xid = fip->flogi_oxid;
		fip->flogi_oxid = ntohs(fh->fh_ox_id);
		if (fip->state == FIP_ST_AUTO) {
			if (old_xid == FC_XID_UNKNOWN)
				fip->flogi_count = 0;
			fip->flogi_count++;
			if (fip->flogi_count < 3)
				goto drop;
			fip->map_dest = 1;
			return 0;
		}
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		if (fip->state == FIP_ST_NON_FIP)
			fip->map_dest = 1;
	}

	if (fip->state == FIP_ST_NON_FIP)
		return 0;

	switch (op) {
	case ELS_FLOGI:
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		op = FIP_DT_FLOGI;
		break;
	case ELS_FDISC:
		if (ntoh24(fh->fh_s_id))
			return 0;
		op = FIP_DT_FDISC;
		break;
	case ELS_LOGO:
		if (fip->state != FIP_ST_ENABLED)
			return 0;
		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
			return 0;
		op = FIP_DT_LOGO;
		break;
	case ELS_LS_ACC:
		if (fip->flogi_oxid == FC_XID_UNKNOWN)
			return 0;
		if (!ntoh24(fh->fh_s_id))
			return 0;
		if (fip->state == FIP_ST_AUTO)
			return 0;
		/*
		 * Here we must've gotten an SID by accepting an FLOGI
		 * from a point-to-point connection.  Switch to using
		 * the source mac based on the SID.  The destination
		 * MAC in this case would have been set by receving the
		 * FLOGI.
		 */
		fip->flogi_oxid = FC_XID_UNKNOWN;
		fc_fcoe_set_mac(fip->data_src_addr, fh->fh_s_id);
		return 0;
	default:
		if (fip->state != FIP_ST_ENABLED)
			goto drop;
		return 0;
	}
	if (fcoe_ctlr_encaps(fip, op, skb))
		goto drop;
	fip->send(fip, skb);
	return -EINPROGRESS;
drop:
	kfree_skb(skb);
	return -EINVAL;
}
EXPORT_SYMBOL(fcoe_ctlr_els_send);

/*
 * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller.
 * @fip:	FCoE controller.
 *
 * Called with lock held.
 *
 * An FCF is considered old if we have missed three advertisements.
 * That is, there have been no valid advertisement from it for three
 * times its keep-alive period including fuzz.
 *
 * In addition, determine the time when an FCF selection can occur.
 */
static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;
	unsigned long sel_time = 0;

	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
		if (time_after(jiffies, fcf->time + fcf->fka_period * 3 +
			       msecs_to_jiffies(FIP_FCF_FUZZ * 3))) {
			if (fip->sel_fcf == fcf)
				fip->sel_fcf = NULL;
			list_del(&fcf->list);
			WARN_ON(!fip->fcf_count);
			fip->fcf_count--;
			kfree(fcf);
		} else if (fcoe_ctlr_mtu_valid(fcf) &&
			   (!sel_time || time_before(sel_time, fcf->time))) {
			sel_time = fcf->time;
		}
	}
	if (sel_time) {
		sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		fip->sel_time = sel_time;
		if (time_before(sel_time, fip->timer.expires))
			mod_timer(&fip->timer, sel_time);
	} else {
		fip->sel_time = 0;
	}
}

/**
 * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry.
 * @skb:	received FIP advertisement frame
 * @fcf:	resulting FCF entry.
 *
 * Returns zero on a valid parsed advertisement,
 * otherwise returns non zero value.
 */
static int fcoe_ctlr_parse_adv(struct sk_buff *skb, struct fcoe_fcf *fcf)
{
	struct fip_header *fiph;
	struct fip_desc *desc = NULL;
	struct fip_wwn_desc *wwn;
	struct fip_fab_desc *fab;
	struct fip_fka_desc *fka;
	unsigned long t;
	size_t rlen;
	size_t dlen;

	memset(fcf, 0, sizeof(*fcf));
	fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);

	fiph = (struct fip_header *)skb->data;
	fcf->flags = ntohs(fiph->fip_flags);

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		return -EINVAL;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			return -EINVAL;
		switch (desc->fip_dtype) {
		case FIP_DT_PRI:
			if (dlen != sizeof(struct fip_pri_desc))
				goto len_err;
			fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
			break;
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(fcf->fcf_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(fcf->fcf_mac)) {
640 641
				LIBFCOE_FIP_DBG("Invalid MAC address "
						"in FIP adv\n");
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673
				return -EINVAL;
			}
			break;
		case FIP_DT_NAME:
			if (dlen != sizeof(struct fip_wwn_desc))
				goto len_err;
			wwn = (struct fip_wwn_desc *)desc;
			fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
			break;
		case FIP_DT_FAB:
			if (dlen != sizeof(struct fip_fab_desc))
				goto len_err;
			fab = (struct fip_fab_desc *)desc;
			fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
			fcf->vfid = ntohs(fab->fd_vfid);
			fcf->fc_map = ntoh24(fab->fd_map);
			break;
		case FIP_DT_FKA:
			if (dlen != sizeof(struct fip_fka_desc))
				goto len_err;
			fka = (struct fip_fka_desc *)desc;
			t = ntohl(fka->fd_fka_period);
			if (t >= FCOE_CTLR_MIN_FKA)
				fcf->fka_period = msecs_to_jiffies(t);
			break;
		case FIP_DT_MAP_OUI:
		case FIP_DT_FCOE_SIZE:
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
		default:
674 675
			LIBFCOE_FIP_DBG("unexpected descriptor type %x "
					"in FIP adv\n", desc->fip_dtype);
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return -EINVAL;
			continue;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}
	if (!fcf->fc_map || (fcf->fc_map & 0x10000))
		return -EINVAL;
	if (!fcf->switch_name || !fcf->fabric_name)
		return -EINVAL;
	return 0;

len_err:
691 692
	LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n",
			desc->fip_dtype, dlen);
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
	return -EINVAL;
}

/**
 * fcoe_ctlr_recv_adv() - Handle an incoming advertisement.
 * @fip:	FCoE controller.
 * @skb:	Received FIP packet.
 */
static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf new;
	struct fcoe_fcf *found;
	unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
	int first = 0;
	int mtu_valid;

	if (fcoe_ctlr_parse_adv(skb, &new))
		return;

	spin_lock_bh(&fip->lock);
	first = list_empty(&fip->fcfs);
	found = NULL;
	list_for_each_entry(fcf, &fip->fcfs, list) {
		if (fcf->switch_name == new.switch_name &&
		    fcf->fabric_name == new.fabric_name &&
		    fcf->fc_map == new.fc_map &&
		    compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
			found = fcf;
			break;
		}
	}
	if (!found) {
		if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
			goto out;

		fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
		if (!fcf)
			goto out;

		fip->fcf_count++;
		memcpy(fcf, &new, sizeof(new));
		list_add(&fcf->list, &fip->fcfs);
	} else {
		/*
		 * Flags in advertisements are ignored once the FCF is
		 * selected.  Flags in unsolicited advertisements are
		 * ignored after a usable solicited advertisement
		 * has been received.
		 */
		if (fcf == fip->sel_fcf) {
			fip->ctlr_ka_time -= fcf->fka_period;
			fip->ctlr_ka_time += new.fka_period;
			if (time_before(fip->ctlr_ka_time, fip->timer.expires))
				mod_timer(&fip->timer, fip->ctlr_ka_time);
		} else if (!fcoe_ctlr_fcf_usable(fcf))
			fcf->flags = new.flags;
		fcf->fka_period = new.fka_period;
		memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
	}
	mtu_valid = fcoe_ctlr_mtu_valid(fcf);
	fcf->time = jiffies;
755 756 757 758
	if (!found) {
		LIBFCOE_FIP_DBG("New FCF for fab %llx map %x val %d\n",
				fcf->fabric_name, fcf->fc_map, mtu_valid);
	}
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834

	/*
	 * If this advertisement is not solicited and our max receive size
	 * hasn't been verified, send a solicited advertisement.
	 */
	if (!mtu_valid)
		fcoe_ctlr_solicit(fip, fcf);

	/*
	 * If its been a while since we did a solicit, and this is
	 * the first advertisement we've received, do a multicast
	 * solicitation to gather as many advertisements as we can
	 * before selection occurs.
	 */
	if (first && time_after(jiffies, fip->sol_time + sol_tov))
		fcoe_ctlr_solicit(fip, NULL);

	/*
	 * If this is the first validated FCF, note the time and
	 * set a timer to trigger selection.
	 */
	if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) {
		fip->sel_time = jiffies +
				msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		if (!timer_pending(&fip->timer) ||
		    time_before(fip->sel_time, fip->timer.expires))
			mod_timer(&fip->timer, fip->sel_time);
	}
out:
	spin_unlock_bh(&fip->lock);
}

/**
 * fcoe_ctlr_recv_els() - Handle an incoming FIP-encapsulated ELS frame.
 * @fip:	FCoE controller.
 * @skb:	Received FIP packet.
 */
static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fc_lport *lp = fip->lp;
	struct fip_header *fiph;
	struct fc_frame *fp;
	struct fc_frame_header *fh = NULL;
	struct fip_desc *desc;
	struct fip_encaps *els;
	struct fcoe_dev_stats *stats;
	enum fip_desc_type els_dtype = 0;
	u8 els_op;
	u8 sub;
	u8 granted_mac[ETH_ALEN] = { 0 };
	size_t els_len = 0;
	size_t rlen;
	size_t dlen;

	fiph = (struct fip_header *)skb->data;
	sub = fiph->fip_subcode;
	if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
		goto drop;

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		goto drop;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			goto drop;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(granted_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(granted_mac)) {
835 836
				LIBFCOE_FIP_DBG("Invalid MAC address "
						"in FIP ELS\n");
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
				goto drop;
			}
			break;
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
			if (fh)
				goto drop;
			if (dlen < sizeof(*els) + sizeof(*fh) + 1)
				goto len_err;
			els_len = dlen - sizeof(*els);
			els = (struct fip_encaps *)desc;
			fh = (struct fc_frame_header *)(els + 1);
			els_dtype = desc->fip_dtype;
			break;
		default:
854 855
			LIBFCOE_FIP_DBG("unexpected descriptor type %x "
					"in FIP adv\n", desc->fip_dtype);
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				goto drop;
			continue;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	if (!fh)
		goto drop;
	els_op = *(u8 *)(fh + 1);

	if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id) &&
	    els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) {
		fip->flogi_oxid = FC_XID_UNKNOWN;
		fip->update_mac(fip, fip->data_src_addr, granted_mac);
		memcpy(fip->data_src_addr, granted_mac, ETH_ALEN);
	}

	/*
	 * Convert skb into an fc_frame containing only the ELS.
	 */
	skb_pull(skb, (u8 *)fh - skb->data);
	skb_trim(skb, els_len);
	fp = (struct fc_frame *)skb;
	fc_frame_init(fp);
	fr_sof(fp) = FC_SOF_I3;
	fr_eof(fp) = FC_EOF_T;
	fr_dev(fp) = lp;

	stats = fc_lport_get_stats(lp);
	stats->RxFrames++;
	stats->RxWords += skb->len / FIP_BPW;

892
	fc_exch_recv(lp, fp);
893 894 895
	return;

len_err:
896 897
	LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n",
			desc->fip_dtype, dlen);
898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922
drop:
	kfree_skb(skb);
}

/**
 * fcoe_ctlr_recv_els() - Handle an incoming link reset frame.
 * @fip:	FCoE controller.
 * @fh:		Received FIP header.
 *
 * There may be multiple VN_Port descriptors.
 * The overall length has already been checked.
 */
static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
				      struct fip_header *fh)
{
	struct fip_desc *desc;
	struct fip_mac_desc *mp;
	struct fip_wwn_desc *wp;
	struct fip_vn_desc *vp;
	size_t rlen;
	size_t dlen;
	struct fcoe_fcf *fcf = fip->sel_fcf;
	struct fc_lport *lp = fip->lp;
	u32	desc_mask;

923
	LIBFCOE_FIP_DBG("Clear Virtual Link received\n");
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
	if (!fcf)
		return;
	if (!fcf || !fc_host_port_id(lp->host))
		return;

	/*
	 * mask of required descriptors.  Validating each one clears its bit.
	 */
	desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID);

	rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
	desc = (struct fip_desc *)(fh + 1);
	while (rlen >= sizeof(*desc)) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen > rlen)
			return;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			mp = (struct fip_mac_desc *)desc;
			if (dlen < sizeof(*mp))
				return;
			if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
				return;
			desc_mask &= ~BIT(FIP_DT_MAC);
			break;
		case FIP_DT_NAME:
			wp = (struct fip_wwn_desc *)desc;
			if (dlen < sizeof(*wp))
				return;
			if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
				return;
			desc_mask &= ~BIT(FIP_DT_NAME);
			break;
		case FIP_DT_VN_ID:
			vp = (struct fip_vn_desc *)desc;
			if (dlen < sizeof(*vp))
				return;
			if (compare_ether_addr(vp->fd_mac,
			    fip->data_src_addr) == 0 &&
			    get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn &&
			    ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host))
				desc_mask &= ~BIT(FIP_DT_VN_ID);
			break;
		default:
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return;
			break;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	/*
	 * reset only if all required descriptors were present and valid.
	 */
	if (desc_mask) {
981
		LIBFCOE_FIP_DBG("missing descriptors mask %x\n", desc_mask);
982
	} else {
983
		LIBFCOE_FIP_DBG("performing Clear Virtual Link\n");
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
		fcoe_ctlr_reset(fip, FIP_ST_ENABLED);
	}
}

/**
 * fcoe_ctlr_recv() - Receive a FIP frame.
 * @fip:	FCoE controller.
 * @skb:	Received FIP packet.
 *
 * This is called from NET_RX_SOFTIRQ.
 */
void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	spin_lock_bh(&fip->fip_recv_list.lock);
	__skb_queue_tail(&fip->fip_recv_list, skb);
	spin_unlock_bh(&fip->fip_recv_list.lock);
	schedule_work(&fip->recv_work);
}
EXPORT_SYMBOL(fcoe_ctlr_recv);

/**
 * fcoe_ctlr_recv_handler() - Receive a FIP frame.
 * @fip:	FCoE controller.
 * @skb:	Received FIP packet.
 *
 * Returns non-zero if the frame is dropped.
 */
static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fip_header *fiph;
	struct ethhdr *eh;
	enum fip_state state;
	u16 op;
	u8 sub;

	if (skb_linearize(skb))
		goto drop;
	if (skb->len < sizeof(*fiph))
		goto drop;
	eh = eth_hdr(skb);
	if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
	    compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS))
		goto drop;
	fiph = (struct fip_header *)skb->data;
	op = ntohs(fiph->fip_op);
	sub = fiph->fip_subcode;

	if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
		goto drop;
	if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
		goto drop;

	spin_lock_bh(&fip->lock);
	state = fip->state;
	if (state == FIP_ST_AUTO) {
		fip->map_dest = 0;
		fip->state = FIP_ST_ENABLED;
		state = FIP_ST_ENABLED;
1042
		LIBFCOE_FIP_DBG("Using FIP mode\n");
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
	}
	spin_unlock_bh(&fip->lock);
	if (state != FIP_ST_ENABLED)
		goto drop;

	if (op == FIP_OP_LS) {
		fcoe_ctlr_recv_els(fip, skb);	/* consumes skb */
		return 0;
	}
	if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
		fcoe_ctlr_recv_adv(fip, skb);
	else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
		fcoe_ctlr_recv_clr_vlink(fip, fiph);
	kfree_skb(skb);
	return 0;
drop:
	kfree_skb(skb);
	return -1;
}

/**
 * fcoe_ctlr_select() - Select the best FCF, if possible.
 * @fip:	FCoE controller.
 *
 * If there are conflicting advertisements, no FCF can be chosen.
 *
 * Called with lock held.
 */
static void fcoe_ctlr_select(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *best = NULL;

	list_for_each_entry(fcf, &fip->fcfs, list) {
1077 1078 1079
		LIBFCOE_FIP_DBG("consider FCF for fab %llx VFID %d map %x "
				"val %d\n", fcf->fabric_name, fcf->vfid,
				fcf->fc_map, fcoe_ctlr_mtu_valid(fcf));
1080
		if (!fcoe_ctlr_fcf_usable(fcf)) {
1081 1082 1083 1084 1085
			LIBFCOE_FIP_DBG("FCF for fab %llx map %x %svalid "
					"%savailable\n", fcf->fabric_name,
					fcf->fc_map, (fcf->flags & FIP_FL_SOL)
					? "" : "in", (fcf->flags & FIP_FL_AVAIL)
					? "" : "un");
1086 1087 1088 1089 1090 1091 1092 1093 1094
			continue;
		}
		if (!best) {
			best = fcf;
			continue;
		}
		if (fcf->fabric_name != best->fabric_name ||
		    fcf->vfid != best->vfid ||
		    fcf->fc_map != best->fc_map) {
1095 1096
			LIBFCOE_FIP_DBG("Conflicting fabric, VFID, "
					"or FC-MAP\n");
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
			return;
		}
		if (fcf->pri < best->pri)
			best = fcf;
	}
	fip->sel_fcf = best;
}

/**
 * fcoe_ctlr_timeout() - FIP timer function.
 * @arg:	&fcoe_ctlr pointer.
 *
 * Ages FCFs.  Triggers FCF selection if possible.  Sends keep-alives.
 */
static void fcoe_ctlr_timeout(unsigned long arg)
{
	struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
	struct fcoe_fcf *sel;
	struct fcoe_fcf *fcf;
	unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
	u8 send_ctlr_ka;
	u8 send_port_ka;

	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_DISABLED) {
		spin_unlock_bh(&fip->lock);
		return;
	}

	fcf = fip->sel_fcf;
	fcoe_ctlr_age_fcfs(fip);

	sel = fip->sel_fcf;
	if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) {
		fcoe_ctlr_select(fip);
		sel = fip->sel_fcf;
		fip->sel_time = 0;
	}

	if (sel != fcf) {
		fcf = sel;		/* the old FCF may have been freed */
		if (sel) {
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			printk(KERN_INFO "libfcoe: host%d: FIP selected "
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Johannes Berg committed
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			       "Fibre-Channel Forwarder MAC %pM\n",
			       fip->lp->host->host_no, sel->fcf_mac);
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			memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
			fip->port_ka_time = jiffies +
					    msecs_to_jiffies(FIP_VN_KA_PERIOD);
			fip->ctlr_ka_time = jiffies + sel->fka_period;
			fip->link = 1;
		} else {
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			printk(KERN_NOTICE "libfcoe: host%d: "
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			       "FIP Fibre-Channel Forwarder timed out.  "
			       "Starting FCF discovery.\n",
			       fip->lp->host->host_no);
			fip->link = 0;
		}
		schedule_work(&fip->link_work);
	}

	send_ctlr_ka = 0;
	send_port_ka = 0;
	if (sel) {
		if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
			fip->ctlr_ka_time = jiffies + sel->fka_period;
			send_ctlr_ka = 1;
		}
		if (time_after(next_timer, fip->ctlr_ka_time))
			next_timer = fip->ctlr_ka_time;

		if (time_after_eq(jiffies, fip->port_ka_time)) {
			fip->port_ka_time += jiffies +
					msecs_to_jiffies(FIP_VN_KA_PERIOD);
			send_port_ka = 1;
		}
		if (time_after(next_timer, fip->port_ka_time))
			next_timer = fip->port_ka_time;
		mod_timer(&fip->timer, next_timer);
	} else if (fip->sel_time) {
		next_timer = fip->sel_time +
				msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		mod_timer(&fip->timer, next_timer);
	}
	spin_unlock_bh(&fip->lock);

	if (send_ctlr_ka)
		fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr);
	if (send_port_ka)
		fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr);
}

/**
 * fcoe_ctlr_link_work() - worker thread function for link changes.
 * @work:	pointer to link_work member inside &fcoe_ctlr.
 *
 * See if the link status has changed and if so, report it.
 *
 * This is here because fc_linkup() and fc_linkdown() must not
 * be called from the timer directly, since they use a mutex.
 */
static void fcoe_ctlr_link_work(struct work_struct *work)
{
	struct fcoe_ctlr *fip;
	int link;
	int last_link;

	fip = container_of(work, struct fcoe_ctlr, link_work);
	spin_lock_bh(&fip->lock);
	last_link = fip->last_link;
	link = fip->link;
	fip->last_link = link;
	spin_unlock_bh(&fip->lock);

	if (last_link != link) {
		if (link)
			fc_linkup(fip->lp);
		else
			fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
	}
}

/**
 * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames.
 * @recv_work:	pointer to recv_work member inside &fcoe_ctlr.
 */
static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
{
	struct fcoe_ctlr *fip;
	struct sk_buff *skb;

	fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
	spin_lock_bh(&fip->fip_recv_list.lock);
	while ((skb = __skb_dequeue(&fip->fip_recv_list))) {
		spin_unlock_bh(&fip->fip_recv_list.lock);
		fcoe_ctlr_recv_handler(fip, skb);
		spin_lock_bh(&fip->fip_recv_list.lock);
	}
	spin_unlock_bh(&fip->fip_recv_list.lock);
}

/**
 * fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request.
 * @fip:	FCoE controller.
 * @fp:		FC frame.
 * @sa:		Ethernet source MAC address from received FCoE frame.
 *
 * Snoop potential response to FLOGI or even incoming FLOGI.
 *
 * The caller has checked that we are waiting for login as indicated
 * by fip->flogi_oxid != FC_XID_UNKNOWN.
 *
 * The caller is responsible for freeing the frame.
 *
 * Return non-zero if the frame should not be delivered to libfc.
 */
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa)
{
	struct fc_frame_header *fh;
	u8 op;
	u8 mac[ETH_ALEN];

	fh = fc_frame_header_get(fp);
	if (fh->fh_type != FC_TYPE_ELS)
		return 0;

	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id)) {

		spin_lock_bh(&fip->lock);
		if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
			spin_unlock_bh(&fip->lock);
			return -EINVAL;
		}
		fip->state = FIP_ST_NON_FIP;
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		LIBFCOE_FIP_DBG("received FLOGI LS_ACC using non-FIP mode\n");
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		/*
		 * FLOGI accepted.
		 * If the src mac addr is FC_OUI-based, then we mark the
		 * address_mode flag to use FC_OUI-based Ethernet DA.
		 * Otherwise we use the FCoE gateway addr
		 */
		if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
			fip->map_dest = 1;
		} else {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
		}
		fip->flogi_oxid = FC_XID_UNKNOWN;
		memcpy(mac, fip->data_src_addr, ETH_ALEN);
		fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id);
		spin_unlock_bh(&fip->lock);

		fip->update_mac(fip, mac, fip->data_src_addr);
	} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
		/*
		 * Save source MAC for point-to-point responses.
		 */
		spin_lock_bh(&fip->lock);
		if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
			if (fip->state == FIP_ST_NON_FIP)
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				LIBFCOE_FIP_DBG("received FLOGI REQ, "
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						"using non-FIP mode\n");
			fip->state = FIP_ST_NON_FIP;
		}
		spin_unlock_bh(&fip->lock);
	}
	return 0;
}
EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);

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/**
 * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
 * @mac: mac address
 * @scheme: check port
 * @port: port indicator for converting
 *
 * Returns: u64 fc world wide name
 */
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
		      unsigned int scheme, unsigned int port)
{
	u64 wwn;
	u64 host_mac;

	/* The MAC is in NO, so flip only the low 48 bits */
	host_mac = ((u64) mac[0] << 40) |
		((u64) mac[1] << 32) |
		((u64) mac[2] << 24) |
		((u64) mac[3] << 16) |
		((u64) mac[4] << 8) |
		(u64) mac[5];

	WARN_ON(host_mac >= (1ULL << 48));
	wwn = host_mac | ((u64) scheme << 60);
	switch (scheme) {
	case 1:
		WARN_ON(port != 0);
		break;
	case 2:
		WARN_ON(port >= 0xfff);
		wwn |= (u64) port << 48;
		break;
	default:
		WARN_ON(1);
		break;
	}

	return wwn;
}
EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);

/**
 * fcoe_libfc_config() - sets up libfc related properties for lport
 * @lp: ptr to the fc_lport
 * @tt: libfc function template
 *
 * Returns : 0 for success
 */
int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
{
	/* Set the function pointers set by the LLDD */
	memcpy(&lp->tt, tt, sizeof(*tt));
	if (fc_fcp_init(lp))
		return -ENOMEM;
	fc_exch_init(lp);
	fc_elsct_init(lp);
	fc_lport_init(lp);
	fc_rport_init(lp);
	fc_disc_init(lp);

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);